Statistics Calculators

Statistical analysis, probability, regression, and data science calculators.

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Showing 23 of 23 calculators

Binomial Distribution

Calculate binomial probabilities, mean, and standard deviation for a given number of trials and success probability.

Chi-Square

Calculate the chi-square statistic, degrees of freedom, and p-value from observed and expected frequencies.

Linear Regression

Calculate the slope, intercept, and R-squared for a simple linear regression from paired data points.

Variance Calculator

Calculate the variance, standard deviation, and mean for a dataset using population or sample formulas.

Percentile Calculator

Calculate the percentile rank of a value in a dataset or find the value at a given percentile.

IQR Calculator

Calculate the interquartile range, quartiles Q1 and Q3, and outlier fences from your dataset.

Margin of Error

Calculate the margin of error for a sample proportion or mean at common confidence levels.

Bayes Theorem

Calculate the posterior probability using Bayes' theorem given prior probability and likelihoods.

Expected Value

Calculate the expected value (weighted average) from a set of outcomes and their probabilities.

Poisson Distribution

Calculate Poisson probabilities for a given average rate and number of event occurrences.

Normal Distribution

Calculate the Z-score and probability for a value in a normal distribution given mean and standard deviation.

Chi-Square Test

Perform a chi-square test of independence with observed and expected values to determine significance.

T-Test Calculator

Calculate the t-statistic for a one-sample t-test given sample mean, hypothesized mean, and sample standard deviation.

ANOVA Calculator

Calculate the F-statistic for one-way ANOVA to compare means across multiple groups.

Regression Calculator

Calculate the regression equation, R-squared, and predicted values from paired data points.

Bayesian Probability

Calculate posterior probability using prior probability, sensitivity, and specificity for diagnostic tests.

Correlation Calculator

Calculate the Pearson correlation coefficient (r) and R-squared from paired data values.

Confidence Interval

Calculate the confidence interval for a population mean from sample statistics and confidence level.

Probability Distribution

Calculate probabilities using common discrete distributions including binomial, Poisson, and geometric.

Effect Size

Calculate Cohen's d effect size from two group means and pooled standard deviation.

Outlier Calculator

Identify outliers in your dataset using the IQR method with lower and upper fence boundaries.

Goodness of Fit

Test whether observed frequencies match expected frequencies using the chi-square goodness-of-fit test.

Five Number Summary

Calculate the five-number summary (minimum, Q1, median, Q3, maximum) and IQR from a dataset.